Hyundai
Contactor Chatter / Unstable Control Signal
Charger makes a clicking sound repeatedly without starting charging.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Insufficient control voltage to contactor coil, Loose coil wiring, Faulty control board output transistor, Rapid enable/disable commands due to firmware or communication issues
How to Fix / Troubleshooting
Safety first: Turn off power before opening the charger.
- Check coil wiring: Inspect the small wires feeding the contactor coil for loose connections or damage.
- Measure control voltage: A technician should measure the coil voltage during start‑up to ensure it meets the contactor’s rating.
- Firmware/app: Ensure the Hyundai app is updated and not sending repeated start/stop commands.
- If chatter continues: Replace the contactor and, if necessary, the main control board driving it.
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Repair Difficulty
Hard
4/5
Required Part
Main Contactor / Control Board Output Stage
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